Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4799378 | Piezoelectric viscometer | Joseph L. Portman, Jr. | 1989-01-24 |
| 4697657 | Piezoelectric weighing device | Joe L. Portman, Jr. | 1987-10-06 |
| 4623030 | Piezoelectric ratio weighing device | Joe L. Portman, Jr. | 1986-11-18 |